<?php

declare(strict_types=1);

namespace App\Filament\Pages\Reviews;

use App\Filament\Resources\TenantReviewResource;
use App\Models\Tenant;
use App\Models\ReviewPack;
use App\Models\TenantReview;
use App\Models\User;
use App\Models\Workspace;
use App\Services\ReviewPackService;
use App\Services\TenantReviews\TenantReviewRegisterService;
use App\Support\Auth\Capabilities;
use App\Support\Findings\FindingOutcomeSemantics;
use App\Support\Filament\TablePaginationProfiles;
use App\Support\ReviewPackStatus;
use App\Support\Ui\GovernanceArtifactTruth\ArtifactTruthEnvelope;
use App\Support\Ui\GovernanceArtifactTruth\ArtifactTruthPresenter;
use App\Support\Ui\GovernanceArtifactTruth\CompressedGovernanceOutcome;
use App\Support\Ui\GovernanceArtifactTruth\SurfaceCompressionContext;
use App\Support\Workspaces\WorkspaceContext;
use BackedEnum;
use Filament\Actions\Action;
use Filament\Pages\Page;
use Filament\Tables\Columns\TextColumn;
use Filament\Tables\Concerns\InteractsWithTable;
use Filament\Tables\Contracts\HasTable;
use Filament\Tables\Filters\SelectFilter;
use Filament\Tables\Table;
use Illuminate\Database\Eloquent\Builder;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use UnitEnum;

class CustomerReviewWorkspace extends Page implements HasTable
{
    use InteractsWithTable;

    public const string DETAIL_CONTEXT_QUERY_KEY = 'customer_workspace';

    private const string SOURCE_SURFACE = 'customer_review_workspace';

    protected static bool $isDiscovered = false;

    protected static string|BackedEnum|null $navigationIcon = 'heroicon-o-document-text';

    protected static string|UnitEnum|null $navigationGroup = 'Reporting';

    protected static ?string $navigationLabel = 'Customer reviews';

    protected static ?int $navigationSort = 44;

    protected static ?string $title = 'Customer Review Workspace';

    protected static ?string $slug = 'reviews/workspace';

    protected string $view = 'filament.pages.reviews.customer-review-workspace';

    public static function tenantPrefilterUrl(Tenant $tenant): string
    {
        $tenantIdentifier = filled($tenant->external_id)
            ? (string) $tenant->external_id
            : (string) $tenant->getKey();

        return static::getUrl(panel: 'admin').'?'.http_build_query([
            'tenant' => $tenantIdentifier,
        ]);
    }

    /**
     * @var array<int, Tenant>|null
     */
    private ?array $authorizedTenants = null;

    public function mount(): void
    {
        $this->authorizePageAccess();
        $this->applyRequestedTenantPrefilter();
        $this->mountInteractsWithTable();
    }

    protected function getHeaderActions(): array
    {
        return [
            Action::make('clear_filters')
                ->label('Clear filters')
                ->icon('heroicon-o-x-mark')
                ->color('gray')
                ->visible(fn (): bool => $this->hasActiveFilters())
                ->action(function (): void {
                    $this->clearWorkspaceFilters();
                }),
        ];
    }

    public function table(Table $table): Table
    {
        return $table
            ->query(fn (): Builder => $this->workspaceQuery())
            ->defaultSort('name')
            ->paginated(TablePaginationProfiles::customPage())
            ->persistFiltersInSession()
            ->persistSearchInSession()
            ->persistSortInSession()
            ->recordUrl(fn (Tenant $record): ?string => $this->latestReviewUrl($record))
            ->columns([
                TextColumn::make('name')->label('Tenant')->searchable()->sortable(),
                TextColumn::make('latest_review')
                    ->label('Latest review')
                    ->badge()
                    ->getStateUsing(fn (Tenant $record): string => $this->latestReviewStateLabel($record))
                    ->color(fn (Tenant $record): string => $this->latestReviewStateColor($record))
                    ->icon(fn (Tenant $record): ?string => $this->latestReviewStateIcon($record))
                    ->iconColor(fn (Tenant $record): ?string => $this->latestReviewStateIconColor($record))
                    ->description(fn (Tenant $record): ?string => $this->reviewOutcomeDescription($record))
                    ->wrap(),
                TextColumn::make('finding_summary')
                    ->label('Key findings')
                    ->getStateUsing(fn (Tenant $record): string => $this->findingSummary($record))
                    ->wrap(),
                TextColumn::make('accepted_risk_summary')
                    ->label('Accepted risks')
                    ->getStateUsing(fn (Tenant $record): string => $this->acceptedRiskSummary($record))
                    ->wrap(),
                TextColumn::make('published_at')
                    ->label('Published')
                    ->getStateUsing(fn (Tenant $record): ?string => $this->latestPublishedAt($record)?->toDateTimeString())
                    ->dateTime()
                    ->placeholder('—'),
                TextColumn::make('review_pack_state')
                    ->label('Review pack')
                    ->getStateUsing(fn (Tenant $record): string => $this->reviewPackAvailability($record)),
            ])
            ->filters([
                SelectFilter::make('tenant_id')
                    ->label('Tenant')
                    ->options(fn (): array => $this->tenantFilterOptions())
                    ->default(fn (): ?string => $this->defaultTenantFilter())
                    ->query(function (Builder $query, array $data): Builder {
                        $tenantId = $data['value'] ?? null;

                        return is_numeric($tenantId)
                            ? $query->whereKey((int) $tenantId)
                            : $query;
                    })
                    ->searchable(),
            ])
            ->actions([
                Action::make('open_latest_review')
                    ->label('Open latest review')
                    ->icon('heroicon-o-arrow-top-right-on-square')
                    ->url(fn (Tenant $record): ?string => $this->latestReviewUrl($record))
                    ->visible(fn (Tenant $record): bool => $this->latestPublishedReview($record) instanceof TenantReview),
                Action::make('download_review_pack')
                    ->label('Download review pack')
                    ->icon('heroicon-o-arrow-down-tray')
                    ->url(fn (Tenant $record): ?string => $this->latestReviewPackDownloadUrl($record))
                    ->openUrlInNewTab()
                    ->visible(fn (Tenant $record): bool => is_string($this->latestReviewPackDownloadUrl($record))),
            ])
            ->bulkActions([])
            ->emptyStateHeading('No entitled tenants match this view')
            ->emptyStateDescription(fn (): string => $this->hasActiveFilters()
                ? 'Clear the current filters to return to the full customer review workspace for your entitled tenants.'
                : 'Adjust filters to return to the full customer review workspace for your entitled tenants.')
            ->emptyStateActions([
                Action::make('clear_filters_empty')
                    ->label('Clear filters')
                    ->icon('heroicon-o-x-mark')
                    ->color('gray')
                    ->visible(fn (): bool => $this->hasActiveFilters())
                    ->action(fn (): mixed => $this->clearWorkspaceFilters()),
            ]);
    }

    /**
     * @return array<int, Tenant>
     */
    public function authorizedTenants(): array
    {
        if ($this->authorizedTenants !== null) {
            return $this->authorizedTenants;
        }

        $user = auth()->user();
        $workspace = $this->workspace();

        if (! $user instanceof User || ! $workspace instanceof Workspace) {
            return $this->authorizedTenants = [];
        }

        return $this->authorizedTenants = app(TenantReviewRegisterService::class)->authorizedTenants($user, $workspace);
    }

    private function authorizePageAccess(): void
    {
        $user = auth()->user();
        $workspace = $this->workspace();

        if (! $user instanceof User) {
            abort(403);
        }

        if (! $workspace instanceof Workspace) {
            throw new NotFoundHttpException;
        }

        $service = app(TenantReviewRegisterService::class);

        if (! $service->canAccessWorkspace($user, $workspace)) {
            throw new NotFoundHttpException;
        }

        if ($this->authorizedTenants() === []) {
            throw new NotFoundHttpException;
        }
    }

    private function workspaceQuery(): Builder
    {
        $user = auth()->user();
        $workspace = $this->workspace();

        if (! $user instanceof User || ! $workspace instanceof Workspace) {
            return Tenant::query()->whereRaw('1 = 0');
        }

        return app(TenantReviewRegisterService::class)->customerWorkspaceTenantQuery($user, $workspace);
    }

    /**
     * @return array<string, string>
     */
    private function tenantFilterOptions(): array
    {
        return collect($this->authorizedTenants())
            ->mapWithKeys(static fn (Tenant $tenant): array => [
                (string) $tenant->getKey() => $tenant->name,
            ])
            ->all();
    }

    private function defaultTenantFilter(): ?string
    {
        $tenantId = app(WorkspaceContext::class)->lastTenantId(request());

        return is_int($tenantId) && array_key_exists($tenantId, $this->authorizedTenants())
            ? (string) $tenantId
            : null;
    }

    private function applyRequestedTenantPrefilter(): void
    {
        $requestedTenant = request()->query('tenant', request()->query('tenant_id'));

        if (! is_string($requestedTenant) && ! is_numeric($requestedTenant)) {
            return;
        }

        foreach ($this->authorizedTenants() as $tenant) {
            if ((string) $tenant->getKey() !== (string) $requestedTenant && (string) $tenant->external_id !== (string) $requestedTenant) {
                continue;
            }

            $this->tableFilters['tenant_id']['value'] = (string) $tenant->getKey();
            $this->tableDeferredFilters['tenant_id']['value'] = (string) $tenant->getKey();

            return;
        }

        throw new NotFoundHttpException;
    }

    private function hasActiveFilters(): bool
    {
        return $this->currentTenantFilterId() !== null;
    }

    private function clearWorkspaceFilters(): void
    {
        app(WorkspaceContext::class)->clearLastTenantId(request());
        $this->removeTableFilters();
    }

    private function currentTenantFilterId(): ?int
    {
        $tenantFilter = data_get($this->tableFilters, 'tenant_id.value');

        if (! is_numeric($tenantFilter)) {
            $tenantFilter = data_get(session()->get($this->getTableFiltersSessionKey(), []), 'tenant_id.value');
        }

        return is_numeric($tenantFilter) ? (int) $tenantFilter : null;
    }

    private function workspace(): ?Workspace
    {
        $workspaceId = app(WorkspaceContext::class)->currentWorkspaceId(request());

        return is_numeric($workspaceId)
            ? Workspace::query()->whereKey((int) $workspaceId)->first()
            : null;
    }

    private function latestPublishedReview(Tenant $tenant): ?TenantReview
    {
        $review = $tenant->tenantReviews->first();

        return $review instanceof TenantReview ? $review : null;
    }

    private function latestReviewUrl(Tenant $tenant): ?string
    {
        $review = $this->latestPublishedReview($tenant);

        if (! $review instanceof TenantReview) {
            return null;
        }

        return TenantReviewResource::tenantScopedUrl('view', ['record' => $review], $tenant, 'tenant').'?'.http_build_query([
            self::DETAIL_CONTEXT_QUERY_KEY => 1,
        ]);
    }

    private function latestReviewPack(Tenant $tenant): ?ReviewPack
    {
        $review = $this->latestPublishedReview($tenant);
        $pack = $review?->currentExportReviewPack;

        return $pack instanceof ReviewPack ? $pack : null;
    }

    private function latestReviewPackDownloadUrl(Tenant $tenant): ?string
    {
        $user = auth()->user();
        $pack = $this->latestReviewPack($tenant);

        if (! $user instanceof User || ! $pack instanceof ReviewPack) {
            return null;
        }

        if (! $user->can(Capabilities::REVIEW_PACK_VIEW, $tenant)) {
            return null;
        }

        if ($pack->status !== ReviewPackStatus::Ready->value) {
            return null;
        }

        if ($pack->expires_at !== null && $pack->expires_at->isPast()) {
            return null;
        }

        return app(ReviewPackService::class)->generateDownloadUrl($pack, [
            'source_surface' => self::SOURCE_SURFACE,
        ]);
    }

    private function latestPublishedAt(Tenant $tenant): ?\Illuminate\Support\Carbon
    {
        return $this->latestPublishedReview($tenant)?->published_at;
    }

    private function reviewTruth(Tenant $tenant): ?ArtifactTruthEnvelope
    {
        $review = $this->latestPublishedReview($tenant);

        return $review instanceof TenantReview
            ? app(ArtifactTruthPresenter::class)->forTenantReview($review)
            : null;
    }

    private function reviewOutcome(Tenant $tenant): ?CompressedGovernanceOutcome
    {
        $presenter = app(ArtifactTruthPresenter::class);
        $review = $this->latestPublishedReview($tenant);
        $truth = $this->reviewTruth($tenant);

        if (! $review instanceof TenantReview || ! $truth instanceof ArtifactTruthEnvelope) {
            return null;
        }

        return $presenter->compressedOutcomeFor($review, SurfaceCompressionContext::reviewRegister())
            ?? $presenter->compressedOutcomeFromEnvelope($truth, SurfaceCompressionContext::reviewRegister());
    }

    private function latestReviewStateLabel(Tenant $tenant): string
    {
        return $this->reviewOutcome($tenant)?->primaryLabel ?? 'No published review';
    }

    private function latestReviewStateColor(Tenant $tenant): string
    {
        return $this->reviewOutcome($tenant)?->primaryBadge->color ?? 'gray';
    }

    private function latestReviewStateIcon(Tenant $tenant): ?string
    {
        return $this->reviewOutcome($tenant)?->primaryBadge->icon;
    }

    private function latestReviewStateIconColor(Tenant $tenant): ?string
    {
        return $this->reviewOutcome($tenant)?->primaryBadge->iconColor;
    }

    private function reviewOutcomeDescription(Tenant $tenant): ?string
    {
        $review = $this->latestPublishedReview($tenant);

        if (! $review instanceof TenantReview) {
            return 'No published review available yet';
        }

        $primaryReason = $this->reviewOutcome($tenant)?->primaryReason;
        $summary = is_array($review->summary) ? $review->summary : [];
        $findingOutcomes = $summary['finding_outcomes'] ?? null;

        if (! is_array($findingOutcomes)) {
            return $primaryReason;
        }

        $findingOutcomeSummary = app(FindingOutcomeSemantics::class)->compactOutcomeSummary($findingOutcomes);

        if ($findingOutcomeSummary === null) {
            return $primaryReason;
        }

        return trim($primaryReason.' Terminal outcomes: '.$findingOutcomeSummary.'.');
    }

    private function findingSummary(Tenant $tenant): string
    {
        $review = $this->latestPublishedReview($tenant);

        if (! $review instanceof TenantReview) {
            return 'No published review available yet';
        }

        $summary = is_array($review->summary) ? $review->summary : [];
        $findingCount = (int) ($summary['finding_count'] ?? 0);
        $findingOutcomes = is_array($summary['finding_outcomes'] ?? null) ? $summary['finding_outcomes'] : [];
        $terminalOutcomes = app(FindingOutcomeSemantics::class)->compactOutcomeSummary($findingOutcomes);

        if ($findingCount === 0) {
            return 'No findings recorded in the published review.';
        }

        if ($terminalOutcomes === null) {
            return sprintf('%d findings summarized in the published review.', $findingCount);
        }

        return sprintf('%d findings. Terminal outcomes: %s.', $findingCount, $terminalOutcomes);
    }

    private function acceptedRiskSummary(Tenant $tenant): string
    {
        $review = $this->latestPublishedReview($tenant);

        if (! $review instanceof TenantReview) {
            return 'No published review available yet';
        }

        $summary = is_array($review->summary) ? $review->summary : [];
        $riskAcceptance = is_array($summary['risk_acceptance'] ?? null) ? $summary['risk_acceptance'] : [];
        $statusMarkedCount = (int) ($riskAcceptance['status_marked_count'] ?? 0);
        $validGovernedCount = (int) ($riskAcceptance['valid_governed_count'] ?? 0);
        $warningCount = (int) ($riskAcceptance['warning_count'] ?? 0);

        return match (true) {
            $statusMarkedCount === 0 => 'No accepted risks recorded.',
            $warningCount > 0 => sprintf('%d accepted risks need governance follow-up (%d total).', $warningCount, $statusMarkedCount),
            $validGovernedCount > 0 => sprintf('%d accepted risks are governed.', $validGovernedCount),
            default => sprintf('%d accepted risks are on record.', $statusMarkedCount),
        };
    }

    private function reviewPackAvailability(Tenant $tenant): string
    {
        $pack = $this->latestReviewPack($tenant);

        if (! $pack instanceof ReviewPack) {
            return 'Unavailable';
        }

        if ($pack->status !== ReviewPackStatus::Ready->value) {
            return 'Unavailable';
        }

        if ($pack->expires_at !== null && $pack->expires_at->isPast()) {
            return 'Unavailable';
        }

        return 'Available';
    }
}